Why does a hard disk use rotating platters and a mechanical head to read data?

Correct answer: To access data stored on magnetic surfaces

A traditional hard disk stores bits by changing magnetic patterns on the surfaces of rotating platters. The platters spin so the required track passes beneath the read/write head, and the head detects or changes the magnetic patterns. Therefore option C is correct. Printing, sound amplification, and touch input are functions of other peripherals, not the disk’s mechanical storage mechanism. Moving parts also cause latency and wear.